Brihadaranyaka Upanishad 2.1.13

2.1.13

sa hovāca gārmyo ya evāyamātmani puruṣa etamevāhaṃ brahmopāsa iti sa hovācājātaśatrurmā maitasminsaṃvadiṣṭhā ātmanvīti vā ahametamupāsa iti sa ya etamevamupāsta ātmanvī ha bhavatyātmanvinī hāsya prajābhavati sa ha tūṣṇīmāsa gārgyaḥ

Gârgya said, 'This being who is in the self, I meditate upon as Brahman.' Ajâtashatru said, 'Please don't talk about him, I meditate upon him as self-possessed.' He who meditates upon him as such becomes self-possessed, and his progeny too becomes self-possessed. Gârgya remained silent.